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“At slightly higher concentrations, tannin promotes the dose-dependent release of arachidonic acid from the macrophage membranes (EC50 = 65 micrograms/mL), which could also contribute to the local inflammatory reaction.”
“The release of AA from EC was markedly inhibited either by scavengers of H2O2, by proteinase inhibitors, by cationic agents,by HClO, by tannic acid , and by quinacrin.”
“Both beta-glucan and tannin stimulated acyl turnover, especially arachidonic acid turnover, in these and other lipid classes by a factor of 2 or more.”
“Earlier work had shown that these agonists exhibit different effects on arachidonate liberation and release, and that only tannin inhibits the uptake and incorporation of exogenous arachidonic acid , suggesting inhibition of reacylation.”